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Propagation of high-frequency (4- to 50-Hz) P waves in the northeastern United States

Sandia National Laboratories, MS 0655, Albuquerque, New Mexico 87185
SAIC, 1300 North 17th St., Arlington, Virginia 22209
Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York 10964
, POB 224, Stone Ridge, New York 10964

Abstract

We have measured the decay rate of high-frequency (4- to 50-Hz) P waves in the northeastern United States. We analyzed signals from 28 explosions of a 1988 USGS/AFGL/GSC refraction survey recorded at distances between 30 and 400 km. Over this range, the decay rate steadily increases from ^–2 at 10 Hz to ^–4 at 45 Hz. If one assumes geometric spreading of ^–1.3, then the remaining decay is consistent with a nearly frequency-independent Q of about 1000. The results provide a useful parameterization for predicting P-wave spectra at near-regional ranges.